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高压汽轮机汽缸的材料,都采用20CrMo 或15-Cr1Mo1V 耐高温、高韧性合金钢.在加工汽缸中分面的孔时,钻头要承受很大的切削力,若钻头的几何参数和切削用量选择不当,不但钻削效率低,而且会损坏钻头。我们积累了多年来现场服务及实际钻削的经验,摸索出一套合理的钻头几何参数和切削用量来钻削合金钢材料,效果很好.现将具体数据及优点简单介绍如下,供同行们参考(见附图)。几何参数及切削用量切削材料:20CrMo;转速:n=250rpm;进给量:0.56mm/r;钻头直径:φ40～45mm:顶角:130°横刃:1.5mm;切削刃双重后角:α=2～3°,α_1=15～20°,主要优点(1)顶角由标准麻花钻的118°改成130°后,主切削刃缩短,使切屑增厚、易于断屑。
High-pressure turbine cylinder materials are used 20CrMo or 15-Cr1Mo1V high temperature, high toughness alloy steel in the processing of faceted holes in the cylinder, the drill bit to withstand a great cutting force, if the drill bit geometry and cutting the amount of improper selection , Not only low drilling efficiency, but also damage the drill. We have accumulated many years of field service and actual drilling experience, worked out a reasonable set of drill geometry and cutting the amount of material to drill alloy steel, the effect is very good. Now the specific data and advantages of a brief introduction as follows, for colleagues Reference (see attached figure). Geometric parameters and the amount of cutting Cutting material: 20CrMo; speed: n = 250rpm; feed rate: 0.56mm / r; drill diameter: φ40 ~ 45mm: apex angle: 130 ° Chisel: 1.5mm; = 2 ~ 3 °, α_1 = 15 ~ 20 °. Main advantages (1) After the vertex angle is changed from 118 ° of the standard twist drill to 130 °, the main cutting edge is shortened, making the chip thicker and easy to chip-break.